[llvm-bugs] [Bug 33920] New: Backport SVN r308950 to 5.0

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33920

            Bug ID: 33920
           Summary: Backport SVN r308950 to 5.0
           Product: libraries
           Version: 5.0
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: AArch64
          Assignee: unassignedbugs at nondot.org
          Reporter: martin at martin.st
                CC: llvm-bugs at lists.llvm.org

Please backport r308950 ([AArch64] Reserve a 16 byte aligned amount of fixed
stack for win64 varargs) to 5.0. This fixes an issue with the new win/arm64
calling convention.

The support for targeting win/arm64 itself is still immature, but the calling
convention handling in itself should be mature enough, and can be used by Wine
for clang >= 5.0 if this is backported.

This carries no regression risk as it only touches code in new codepaths that
aren't used before.

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